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In what became one of the most cited papers in social science literature, researcher Roy F. Baumeister discovered that willpower actually operates like a muscle; it can be strengthened with practice and fatigued by overuse. In a new book, "Willpower," Baumeister collaborates with New York Times science writer John Tierney to revolutionize our understanding of the most coveted human virtue: self-control.

Willpower: What can we do to increase self-control?

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